After a week of use I would say 4.5 stars. It's very thin and blends well so you can't tell you've glued it on. I was concerned that the slot hole was too small, but the webcam doesn't seem to turn off when I'm using it, so I think it's tailored right to the laptop's camera specs. It stuck very lightly but the glue didn't seem the strongest but I believe it will stay until tampered with. The main reason I left 4 stars and gave it a 4.5 star rating is the product's slip feature. While it slides without restriction, it doesn't really snap into place, so I'm afraid it could easily spring open with an accidental light touch. Untouched it won't move, so it's doing its job well, but I'd just feel more secure if it latched securely when I closed it.
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